Outsourcing Encrypted Excel Files

With the development of cloud computing, the enterprises tend to outsource their data to the third party for saving cost and mobile access. However, simultaneously achieving the security and the operability of the outsourced data becomes a real challenge. Existing solutions mainly deal with the security of the outsourced data, but cannot support the operation of encrypted data at the same time, except for few kinds of operations. In this paper, we propose an outsourcing encrypted Excel file scheme, which supports most operations of the encrypted data, as if it were not encrypted in Excel. Based on extensive experimental tests, the system achieves the function of summing, seeking mean, searching, indexing. The analysis shows that our scheme can provide proper security in practice.